How to fly from the US to the UK as a dual citizen?

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Starting in 2026 the UK no longer allows British Citizens to get an ETA to enter the UK on an American Passport. They must use their British Passport to enter the UK.

The problem I’m seeing that I can’t get a straight answer to is by US law any US citizen must enter and leave the US on a US Passport. So with that being the case how is a dual citizen with two passports meant to fly from the US to the UK?

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So officially leave the uk on the uk passport and then show your citizen papers or whatever to the airline staff if they ask to see them. Or just use your us passport ffs.

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